KR100935187B1 - Downlink Frame Transmitting/Receiving Apparatus and Method in Wireless Communication System - Google Patents

Abstract

Disclosed are an apparatus and method for transmitting and receiving downlink frames in a wireless communication system for adaptively configuring a downlink frame considering a multiple input / multiple output (MIMO) and a hybrid automatic request (HARQ) scheme at a base station and transmitting the same to a terminal. By configuring the aforementioned non-STC zone and STC zone in units of frames or configuring the frames in consideration of MIMO and HARQ in different frames, the base station makes the scheduling very simple and reduces the map size for each frame. In addition, the SISO supporting terminal does not need to decode the downlink map for the STC zone dedicated frame, and there is also no need to receive the corresponding downlink burst, and the MIMO supporting terminal has the downlink map for the non-STC zone dedicated frame. There is no need to decode the signal, and there is no need to receive the corresponding downlink burst, thereby reducing the complexity of the configuration for finding its own burst.

Description

Downlink Frame Transmitting / Receiving Apparatus and Method in Wireless Communication System

The present invention relates to an apparatus and method for transmitting and receiving downlink frames in a wireless communication system, and more particularly, to a downlink frame in which a multiple input / multiple output (MIMO) and hybrid automatic request (HARQ) scheme is considered in a base station. An apparatus and method for transmitting and receiving downlink frames in a wireless communication system configured to transmit to a terminal.

Recently, as the necessity of transmitting a large amount of data at high speed using a wireless channel is rapidly increasing, a wireless / high-speed data transmission system for supporting mobile Internet service in a mobile environment is being actively researched. Multiple input multiple output (MIMO) systems are emerging to support Internet services.

Prior to this MIMO system, a single input single output (SISO) system was common. The SISO system uses a single antenna on a receiving side and a transmitting side, for example, a base station having one antenna and a single antenna. Signals were transmitted and received through one channel (H) formed between the terminals. In this SISO system, multipath phenomena occurred due to obstacles in the propagation paths such as hills, valleys, and pylons, causing problems due to fading. It became.

MIMO (Multiple Input Multiple Output) system, which is recently studied, is a technology that transmits data through multiple paths by increasing the number of antennas of a base station and a terminal, and reduces interference by detecting signals received in each path from the terminal. Spatio-temporal diversity and spatial multiplexing can improve transmission efficiency. This MIMO system has a higher data rate by including a plurality of transmit / receive antennas, which is advantageous in that the capacity of the radio link is improved in comparison with the SISO system in the transmit / receive period. That is, in a multipath-rich environment, multiple orthogonal channels can be created between transceivers so that data for a single user can be transmitted over the air in parallel over orthogonal channels using the same bandwidth at the same time. High spectral efficiency is achieved.

Currently, one base station mixes the above-described SISO system and MIMO system. For example, the base station acquires radio channel information for both the SISO supporting terminal and the MIMO supporting terminal, selects a radio resource and its amount for the above-mentioned terminals, and at the same time determines an appropriate modulation and coding level to transmit to each terminal. do. This will be described in more detail.

1 is a diagram illustrating an OFDM / OFDMA frame structure.

Referring to FIG. 1, the frame is divided into a downlink frame for transmitting data from the base station to the terminal and an uplink frame for transmitting data from the terminal to the base station, and the downlink frame is a preamble ( It consists of Preamble, FCH (Frame Control Header), DL Map (DL MAP), UL Map (UL MAP), and DL Burst. The UL frame consists of control symbols (ranging, ACK). , CQI) and UL bursts. Here, HARQ MAP and HARQ bursts may be selectively added to the downlink frame, or information about the HARQ burst may be recorded in the downlink map or the uplink map without adding the HARQ map. .

The preamble is used to provide time and frequency synchronization and cell information to users, the FCH contains information for decoding frame information and downlink map (DL MAP), and the downlink map (DL MAP) is transmitted by the base station. Downlink bursts include information on whether bursts for SISO, bursts for MIMO, data of which terminal, and which region are located within a frame. In addition, the uplink map (UL-MAP) includes information on uplink bursts (UL-Burst) to be transmitted by the terminals. On the other hand, HARQ burst is a burst used for applying the HARQ method for the reliable data transmission, the ARQ method for transmitting the ACK and the FEC method for inserting the error correction code in the transmission data, HARQ map (HARQ MAP) is It is included in the downlink map and includes information on HARQ bursts. In this case, the downlink map records the allocation information of each downlink burst in two dimensions using the symbol index and the subchannel index, and the HARQ map uses the length of the HARQ burst in one dimension. Record it.

After receiving this frame, the terminal decodes each map to see if there is a data burst assigned to it, and if so, decodes its data burst with reference to each map.

At this time, in a mixed environment of the SISO system and the MIMO system, the base station configures and transmits the downlink bursts for the SISO supporting terminal and the MIMO supporting terminal by configuring the SISO burst and the MIMO burst in one downlink frame, Zone division information is transmitted through the zone switch information element. Accordingly, in the terminal, the decoding processing time for the downlink map may be increased and the complexity of the terminal may be increased. In addition, when the HARQ burst is added to the above-described frame for HARQ, the burst allocation method recorded in the HARQ map is different from the existing data burst allocation method, and the complexity of the terminals for processing the distinction and the processing time due to the HARQ map are also Increase even more.

As a result, in the case of the conventional OFDM / OFDMA frame transmission, the decoding processing time of the terminal is increased, it is impossible to decode all of its own data transmitted within the frame decoding time, or the complexity of the terminal may be increased. Therefore, in order to solve these problems, a new frame composition method for effective data transmission is required.

The present invention was devised to meet the above demands, and an object of the present invention is to provide an apparatus and method for effective downlink frame transmission in a wireless communication system.

Another object of the present invention is to provide an apparatus and method for transmitting a downlink frame in a wireless communication system for adaptively configuring and transmitting a downlink frame considering a MIMO scheme.

Another object of the present invention is to provide an apparatus and method for transmitting a downlink frame in a wireless communication system for adaptively configuring and transmitting a downlink frame considering MIMO and HARQ schemes.

Another object of the present invention is to provide an apparatus and a method for receiving a downlink frame in a wireless communication system.

In addition, another object of the present invention is to provide an apparatus and method for receiving a downlink frame in a wireless communication system that receives a downlink frame in consideration of the MIMO scheme so as not to be decoded.

Another object of the present invention is to provide a downlink frame receiving apparatus in a wireless communication system capable of receiving a downlink frame in consideration of MIMO and HARQ schemes, and thus reducing the complexity of the terminal itself without receiving a decoding load. To provide a method.

According to one aspect of the present invention, there is provided a method for transmitting a downlink frame in a wireless communication system supporting SISO and MIMO, comprising: (a) determining a size of a transmission SISO burst and a MIMO burst, respectively; (b) configuring a frame for transmission of the bursts, separately configuring a frame for the SISO burst and a frame for the MIMO burst; And (c) adaptively allocating the bursts to the frames according to the size of the determined bursts.

In addition, according to another aspect of the present invention, a method for transmitting a downlink frame in a wireless communication system supporting SISO and MIMO includes: (a) determining the size of a transmission SISO burst and a MIMO burst; And (b) adaptively allocating an STC region for the MIMO burst transmission and a non-STC region for the SISO burst transmission to the one downlink frame according to the size of the determined bursts, and transmitting the bursts. Characterized in that.

In addition, according to another aspect of the present invention, a method for transmitting a downlink frame in a wireless communication system supporting SISO, MIMO, SISO-HARQ, and MIMO-HARQ includes (a) transmitting SISO burst, MIMO burst, and SISO-HARQ. Determining a burst and a magnitude of a MIMO-HARQ burst; (b) configuring a frame for transmission of the bursts, separately configuring a frame for a SISO burst, a frame for a SISO-HARQ burst, a frame for a MIMO burst, and a frame for a MIMO-HARQ burst; And (c) adaptively assigning and transmitting the bursts to the separately configured frames according to the size of the determined bursts.

In addition, according to another aspect of the present invention, a method for transmitting a frame in a wireless system in a mixed environment of a MIMO terminal and a SISO terminal that supports or does not support the HARQ function may include (a) a non-STC area (Non Space-Time). Constructing a subframe including a data region including one of a coding zone, an STC region, a non-STC-HARQ region, and an STC-HARQ region; And (b) transmitting the subframe to the terminals.

According to still another aspect of the present invention, a method of transmitting a frame in a wireless communication system in a mixed environment of a MIMO terminal and a SISO terminal includes a data region configured in the order of a non-STC region and an STC region on a time axis. Constructing a subframe comprising a; And transmitting the subframe to the terminals.

According to one embodiment of the present invention, a method for receiving a downlink frame in a wireless communication system in which an SISO-supporting terminal and a MIMO-supporting terminal are mixed includes (a) at least one of a transmission area for SISO or MIMO burst. Receiving a frame to make; (b) confirming transmission area information through a frame control header (FCH) in the received frame; (c) determining whether to perform decoding on the downlink map of the received frame according to the verification result and whether the terminal is the SISO supporting terminal or the MIMO supporting terminal; And (d) performing decoding on the burst of the frame transmission area according to the determination result.

In addition, according to another aspect of the present invention, a method for receiving a downlink frame in a wireless communication system in a mixed environment of SISO, SISO-HARQ, MIMO, and MIMO-HARQ supporting terminals includes (a) SISO, SISO-HARQ, and MIMO. Or receiving a frame including at least one of a transmission region for the MIMO-HARQ burst; (b) confirming transmission area information through a frame control header (FCH) in the received frame; (c) determining whether to perform decoding on the downlink map or the HARQ map of the received frame according to the confirmation result and whether the terminal is the SISO, SISO-HARQ, MIMO, or MIMO-HARQ supported terminal; And (d) performing decoding on the burst of the frame transmission area according to the determination result.

On the other hand, according to one aspect of the present invention, a base station for transmitting a downlink frame in a wireless communication system supporting SISO and MIMO bursts includes: a burst determiner for respectively determining sizes of a transmitted SISO burst and a MIMO burst; And a burst for configuring the frames for transmission of the bursts, separately configuring a frame for the SISO burst and a frame for the MIMO burst, and adaptively allocating the bursts to the frames according to the size of the determined bursts. And an allocating unit.

In addition, according to another aspect of the present invention, in a wireless communication system supporting SISO and MIMO, a base station for transmitting a downlink frame includes: a burst allocator configured to determine a size of a transmission SISO burst and a MIMO burst; And a burst allocator for adaptively allocating an STC region for the MIMO burst transmission and a non-STC region for the SISO burst transmission to the one downlink frame according to the determined burst size.

In addition, according to still another aspect of the present invention, a base station for transmitting a downlink frame in a wireless communication system supporting SISO, MIMO, SISO-HARQ, and MIMO-HARQ includes a transmission SISO burst, a MIMO burst, a SISO-HARQ burst, and A burst determining unit which determines a size of the MIMO-HARQ burst; And configuring a frame for transmission of the bursts, separately configuring a frame for a SISO burst, a frame for a SISO-HARQ burst, a frame for a MIMO burst, and a frame for a MIMO-HARQ burst, and the size of the determined bursts. And a burst allocator for adaptively allocating the bursts to the separately configured frames.

On the other hand, according to one aspect of the present invention, a terminal that receives a downlink frame in a wireless communication system in which an SISO-supporting terminal and a MIMO-supporting terminal are mixed includes at least one of a transmission area for SISO or MIMO burst. Receiving unit for receiving the frame; An area information confirming unit confirming transmission area information through a frame control header (FCH) in the received frame; And determining whether to perform decoding on the downlink map of the received frame according to the check result and whether the terminal is the SISO supporting terminal or the MIMO supporting terminal, and then decodes the burst of the frame transmission region according to the determination result. It characterized in that it comprises a control unit for performing.

In addition, according to another aspect of the present invention, a terminal receiving a downlink frame in a wireless communication system in a mixed environment of SISO, SISO-HARQ, MIMO, and MIMO-HARQ supporting terminals may be SISO, SISO-HARQ, MIMO, or MIMO. A receiving unit for receiving a frame including at least one of a transmission region for a HARQ burst; An area information confirming unit confirming transmission area information through a frame control header (FCH) in the received frame; And determining whether to perform decoding on the downlink map or the HARQ map of the received frame according to the check result and whether the terminal supports the SISO, SISO-HARQ, MIMO, or MIMO-HARQ support terminal. And a controller for decoding the burst of the frame transmission region.

According to the present invention, the base station configures the above-described non-STC zone and STC zone in units of frames, so that the number of times of using the zone switch information element per frame is reduced than when the STC zone and the non-STC zone coexist in one frame. This has the effect of reducing the map size.

In addition, according to the present invention, since the base station configures the frame in consideration of MIMO and HARQ in different frames, the scheduling is very simple and the map size for each frame is reduced, thereby simplifying the configuration at the terminal, and the data processing speed. Has the effect of increasing.

In addition, according to the present invention, since the base station uses at least one pilot pattern in the non-STC zone dedicated frame and at least two pilot patterns in the STC zone dedicated frame, the complexity of the pilot pattern used is reduced.

Further, according to the present invention, the base station adaptively allocates the corresponding burst to the non-STC zone and the STC zone, so that the decoding load is hardly pushed back due to the MIMO decoding processing speed at the terminal.

In addition, according to the present invention, the SISO support terminal does not need to decode the downlink map for the STC zone dedicated frame, and there is no need to receive the corresponding downlink burst, and the MIMO support terminal is the non-STC zone dedicated frame. There is no need to decode the downlink map, and there is no need to receive the corresponding downlink burst, thereby reducing the complexity of the configuration for finding its own burst.

In addition, according to the present invention, the number of pilots that can be used for channel estimation in the terminal is increased, so that accuracy in various processes including channel estimation can be increased, thereby simplifying processing on hardware in actual implementation.

In addition, according to the present invention, one frame of the SISO support terminal receiving the non-STC zone dedicated frame can be rested to save power, and the MIMO support terminal receiving the STC zone dedicated frame can perform MIMO decoding processing of about one frame. Since there is a margin of, the decoding load is hardly pushed back due to the MIMO decoding processing speed.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments. For reference, in the following description, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.

2 is a diagram illustrating a base station based on OFDM / OFDMA.

As shown in FIG. 2, the base station includes an interface 110, a band signal processor 120, a transmitter 130, a receiver 160, a scheduler 150, and an antenna 140. The base station supports TDD and may be divided into a reception path and a transmission path.

In the reception path, the receiver 160 receives one or more radio signals transmitted by the terminals through the antenna 140 and converts them into baseband signals. For example, the receiver 160 removes and amplifies noise from the above-described signal for data reception of the base station, down-converts the amplified signal to a baseband signal, and digitizes the down-converted baseband signal. The band signal processor 120 extracts information or data bits from the digitized signal to perform demodulation, decoding, and error correction processes. The received information is transmitted to the adjacent wired / wireless network via the interface 110 or transmitted to other terminals serviced by the base station.

In the transmission path, the interface 110 receives voice, data, or control information from a control station or a wireless network, and the band signal processor 120 encodes voice, data, or control information and outputs the encoded information to the transmitter 130. do. The transmitter 130 modulates the encoded voice, data, or control information into a carrier signal having a desired transmission frequency or frequencies, amplifies the modulated carrier signal to a level suitable for transmission, and propagates to the air through the antenna 140. do.

On the other hand, the scheduler 150 controls the operation of the reception path and the transmission path and each component. In particular, in relation to the present invention, the scheduler 150 configures a downlink frame to be transmitted to each of the terminals. The STC zone is separately allocated to the STC zone, the zone information is recorded in the downlink map, and the downlink frame is broadcasted to each terminal through the band signal processor 120 and the transmitter 130. Hereinafter, the scheduler will be described in more detail for each embodiment.

3 is a block diagram illustrating a scheduler according to an embodiment of the present invention.

As shown in FIG. 3, the scheduler 150 includes a burst determining unit 151, a burst allocating unit 152, and a map recording unit 153.

The burst determiner 151 determines the size of the burst to be allocated to each terminal. That is, the burst determining unit 151 distinguishes between the SISO supporting terminal and the MIMO supporting terminal, and determines the size of the burst to be allocated to the SISO supporting terminal and the size of the burst to be allocated to the MIMO supporting terminal. At this time, the burst size of each terminal is determined in consideration of the QoS of each terminal.

The burst allocator 152 assigns the bursts determined to be allocated to each terminal to the downlink frame. That is, the burst allocator 152 assigns the SISO burst to the non-STC zone, and assigns the MIMO burst to the STC zone. Here, the burst area allocated on the downlink frame for the MIMO system user is called STC zone, and the burst area allocated on the downlink frame for the other subchannels or SISO system user is called non-STC zone. In addition, the burst allocator 152 makes the burst allocation more adaptively by making the size of the non-STC zone larger than the size of the STC zone in an environment where there are a large number of SISO supporting terminals.

The map recorder 153 records the burst allocation information for each terminal allocated by the burst assigner 152 in a map message. In this case, the burst allocation information for each terminal is recorded using the map information element in the downlink map, and the allocation information for the HARQ burst is recorded using the map information element in the HARQ map. In particular, when changing from the non-STC zone to the STC zone, the map recording unit 153 distinguishes the non-STC zone from the STC zone using the zone switch information element, and records the zone switch information element in the downlink map.

4 is an exemplary diagram illustrating use of a zone switch information element in a downlink map (DL MAP).

As shown in FIG. 4, the downlink map is created to call the extended DIUC [Extended DIUC ()] when the DIUC is 15, and to call the zone switch information element [STC_Zone IE ()] within the extended DIUC function. . If the zone switch information element is frequently called in the downlink map, the zone switch is frequently generated in the STC zone and the non-STC zone. Therefore, the downlink map may be large, and the processing speed of the terminal is slowed down. It is desirable to design the frame to reduce the frequency of use.

5 is a diagram illustrating a pilot pattern when a downlink PUSC subchannel is used in a base station. FIG. 5A illustrates a pilot pattern used in a non-STC zone, and FIG. 5B illustrates a pilot pattern used in a STC zone. The pilot pattern to be used is shown. In particular, FIG. 5 (b) shows the pilot pattern transmitted from the base station having a 2 × 2 MIMO structure.

Referring to FIG. 5A, one downlink PUSC subchannel includes 4 pilot subcarriers and 48 data subcarriers. The basic component unit of the downlink PUSC subchannel is a cluster, and the cluster blocks all subcarriers except for the null subcarrier and the DC subcarrier into 14 adjacent subcarriers. The configured subcarriers are transmitted to the terminal through one antenna.

Referring to FIG. 5 (b), the base station having a 2 × 2 MIMO structure transmits a first pilot pattern including pilots P0 and P3 through a first antenna and includes pilots P1 and P2 through a second antenna. Transmit in the second pilot pattern. In this case, different data subcarriers are allocated to these pilot patterns according to the mode of the STC. That is, in the Space Time Transmit Diversity (STTD) mode, the same data subcarrier is allocated to each of the first pilot pattern and the second pilot pattern, and in the SM (Spatial Multiplexing) mode, each of the first pilot pattern and the second pilot pattern is different from each other. Allocates another data subcarrier. Therefore, the terminal takes more time to process the data subcarriers encoded and transmitted in the SM mode than the data subcarriers encoded and transmitted in the STTD mode. Meanwhile, for convenience of description, the data burst encoded in the STTD mode is referred to as matrix A, and the data burst encoded in the SM mode is referred to as matrix B.

Hereinafter, a method of configuring a downlink frame in a scheduler according to an embodiment of the present invention will be described.

6 is a diagram illustrating a structure of a first frame transmitted from a base station to a terminal, and is an exemplary diagram for allocating a MIMO burst to a downlink frame. Here, the scheduler 150 designs the downlink frame such that the STC zone is positioned at the end of the downlink frame, and the matrix B is located in front of the matrix A in the STC zone.

Referring to FIG. 6, as described above, the downlink frame includes a preamble, a frame control header (FCH), a downlink map (DL-MAP), an uplink map (UL-MAP), and a downlink burst (DL Burst). ), The uplink frame is composed of control symbols (Ranging, ACK, CQI) and uplink burst (UL Burst).

In the illustrated example, since the scheduler 150 should allocate the downlink PUSC subchannel in the case of the above-described FCH, downlink map and uplink map, the downlink frame always starts with a non-STC zone. In addition, the burst allocator 152 divides the downlink frame into non-STC zones and STC zones by zone switch information elements for MIMO support terminals, and allocates downlink MIMO bursts to the divided STC zones. At this time, the burst allocator 152 exchanges the matrix A and the matrix B in the STC zone. That is, the matrix B, which takes a long time in decoding processing, is placed in front of the matrix A, which takes less time. By doing so, matrix B, which has a high complexity, can be processed first, thereby reducing delay caused by decoding at the terminal while using the zone switch information element only once.

The map recording unit 153 then includes this zone switch information element in the downlink map. Meanwhile, the burst allocator 152 designates an uplink MIMO burst region to be allocated by the MIMO supporting terminals in the uplink frame, and the map recording unit 153 records the designated burst region in the uplink map.

FIG. 7 is a diagram illustrating a structure of a second frame transmitted from a base station to a terminal, and is an exemplary diagram for allocating a MIMO burst and an SISO burst to a downlink frame. In this case, the scheduler 150 designs the downlink frame such that the STC zone is located between the non-STC zones of the downlink frame.

Referring to FIG. 7, since the FCH, the downlink map and the uplink map should be allocated to the downlink PUSC subchannel, the downlink frame starts with the non-STC zone. Accordingly, when this subchannel period ends, the burst allocator 152 allocates a downlink MIMO burst to the STC zone and then allocates a downlink SISO burst to the non-STC zone. The map recording unit 153 then records the zone switch information element that distinguishes the STC zone from the non-STC zone and the assigned burst information in the downlink map.

Meanwhile, the burst allocator 152 designates an uplink MIMO burst region to be allocated by the MIMO supporting terminals in the uplink frame, and designates an uplink SISO burst region to be allocated by the SISO supporting terminals. The map recording unit 153 also records the allocated burst area information in the uplink map.

Accordingly, when the scheduler 150 allocates the non-STC zone and the STC zone in this manner, even if the zone switch information element is used twice, the decoding load is reduced by the terminal due to the MIMO decoding processing speed.

FIG. 8 is a diagram illustrating a structure of a third frame transmitted from a base station to a terminal, and is another exemplary diagram for allocating a MIMO burst and an SISO burst to a downlink frame. In this case, the scheduler 150 is designed such that the STC zone is located between the non-STC zones of the downlink frame, and the matrix B is located in front of the matrix A in the STC zone.

Referring to FIG. 8, the frame structure is the same as the frame structure of FIG. 7 described above, but the burst allocator 152 assigns the matrix A and the matrix B in the STC zone in order (the matrix B before the matrix A). That is, the matrix B, which takes a long time in decoding processing, is placed in front of the matrix A, which takes less time. This uses the zone switch information element twice, similar to the frame structure of FIG. In this case, the decoding load is hardly pushed back by the terminal due to the MIMO decoding processing speed.

Hereinafter, a configuration of a terminal for receiving frames having such a structure and a method of receiving the same will be described.

9 is a block diagram illustrating an OFDM / OFDMA-based terminal, and FIGS. 10A and 10B are flowcharts illustrating operations of the terminal of FIG. 9.

As shown in FIG. 9, the terminal is classified into an SISO supporting terminal and a MIMO supporting terminal, and is commonly FFT 210, STC zone determining unit 220, subcarrier extracting unit 230, and zone boundary checking unit 240. ), And a subcarrier processing unit 250. In this case, the subcarrier extractor 230 includes a pilot extractor 231 and a data extractor 232, and the subcarrier processor 250 includes a channel estimator 251 and a decoder 252.

The FFT 210 converts a signal in the time domain received from the base station into a signal in the frequency domain.

The STC zone determination unit 220 receives an input in symbol units from the signal converted into the frequency domain and determines whether the current symbol is an STC zone. Since the first symbol of the downlink frame corresponds to the non-STC zone, the symbols are processed in the non-STC zone until the current symbol is identified as the zone boundary from the zone boundary checker 240. If the current symbol is identified as a zone boundary from the zone boundary checking unit 240, the symbols are processed in the STC zone. That is, if the current symbol is identified as the STC zone by the zone boundary checker 240, the SISO supporting terminal discards the following symbols until it is changed back to the non-STC zone. However, if the current symbol is identified as the STC zone by the zone boundary checker 240, the MIMO supporting terminal processes the following symbols in the STC zone based on MIMO.

The subcarrier extractor 230 includes a pilot extractor 231 and a data extractor 232, and extracts and accumulates pilot and data subcarriers from the current symbol until it is identified as a zone boundary. In this case, the pilot extraction unit 231 differs in the extraction method in the case of pilot extraction in the STC zone and in the non-STC zone. For example, a downlink PUSC subchannel including a frame control header (FCH), a downlink map (DL-MAP), an uplink map (UL-MAP), and a downlink burst (DL Burst) corresponds to a non-STC zone. Since the pilot arrangement in the non-STC zone is as shown in FIG. 5 (A) above, pilots of different positions should be extracted for every symbol, but the pilot arrangement in the STC zone is shown in FIG. 5 (B) described above. Since it is the same, pilots having different positions must be extracted for each two symbols.

The zone boundary checker 240 checks whether the current symbol is a symbol representing a zone boundary and transmits the check result to the STC zone determiner 220. The zone boundary checking unit 240 determines whether the zone boundary symbol is a symbol representing the zone boundary through an indicator of the zone boundary symbol. In this case, since the zone boundary symbol includes a specific indicator indicating that the zone boundary is previously, it may be determined whether the zone boundary symbol exists based on the presence or absence of the indicator. Accordingly, the zone boundary checking unit 240 operates the subsequent subcarrier processing unit 250 when the current symbol is identified as the zone boundary symbol. Otherwise, the zone boundary checking unit 240 notifies the STC zone determination unit 220 to continue extracting the subcarrier as it is. The unit 230 is operated.

The subcarrier processor 250 estimates a channel using pilots extracted / accumulated by the subcarrier extractor 230, and corrects the data subcarrier extracted by the subcarrier extractor 230 based on the estimated channel. Restore it.

The operation of the OFDM / OFDMA based terminal configured as described above will be described with reference to FIGS. 10A and 10B. Since the following detailed process or operation principle has been described in detail in the above-described configuration of the OFDM / OFDMA terminal, redundant descriptions are omitted, and the following description will briefly focus on the steps occurring in time series.

First, referring to FIG. 10A, in case of an SISO supporting terminal, the FFT 210 converts a signal in a time domain received from a base station into a signal in a frequency domain (S261). Subsequently, the STC zone determination unit 220 receives the signal converted into the frequency domain in units of symbols and determines whether the current symbol is the STC zone (S262). As a result of the determination, if it is determined that the current symbol is the STC zone, the current symbol is discarded and step S262 is repeated (S263). However, if it is determined that the current symbol is a non-STC zone, the subcarrier extractor 230 extracts and stores a pilot and data subcarrier for SISO (S264). Next, the zone boundary checking unit 240 determines whether the zone boundary symbol is present through an indicator of the zone boundary symbol (S265). As a result of the determination, if it is not the zone boundary symbol, step S262 or less is repeated, and if it is the zone boundary symbol, non-STC zone processing is performed (S266). That is, the channel is estimated using the pilot, and the original data is restored after correcting the data subcarriers extracted by the subcarrier extracting unit 230 based on the estimated channel.

Next, referring to FIG. 10B, in the case of the MIMO supporting terminal, the FFT 210 converts a signal in the time domain received from the base station into a signal in the frequency domain (S271). Subsequently, the STC zone determination unit 220 receives the signal converted into the frequency domain in symbol units and determines whether the current symbol is the STC zone (S272). As a result of the determination, if it is determined that the STC zone, the subcarrier extraction unit 230 extracts and stores the pilot and data subcarriers for MIMO (S273). Next, the zone boundary checking unit 240 determines whether the zone boundary symbol is present through an indicator of the zone boundary symbol (S274). As a result of the determination, if it is not the zone boundary symbol, step S272 or less is repeated, and if it is the zone boundary symbol, STC processing is performed (S275). That is, the channel is estimated using the pilot, and the original data is restored after correcting the data subcarriers extracted by the subcarrier extracting unit 230 based on the estimated channel. On the other hand, if it is determined in step S272 that the current symbol is a non-STC zone, the current symbol is discarded for the SISO burst (S276).

FIG. 11 is a timing diagram for dividing and processing a frame transmitted from a base station into an STC zone and a non-STC zone by a terminal. FIG. 11 (A) shows a frame configured such that an STC zone follows a non-STC zone in the terminal. 11 shows a timing diagram for processing, and FIG. 11B shows a timing diagram for processing in the terminal a frame configured such that an STC zone comes before a non-STC zone.

In the example shown, when the STC zone processing time and the non-STC zone processing time are compared on the time axis for each frame, the STC zone processing time takes longer than the non-STC zone processing time. As shown in Fig. 11A, when the non-STC zone exists in front of the STC zone, a delay occurs continuously in the STC zone processing at the terminal. Accordingly, a load may continue to occur during MIMO decoding in the terminal, and as a result, the decoding may not be completed. In order to solve this problem, if the STC zone is positioned in front of the non-STC zone in the same manner as the frame structures of FIGS. 7 and 8 described above, it can be seen that the delay is greatly reduced as shown in FIG. 11 (B) when the terminal processes the STC zone.

Meanwhile, as another embodiment of the present invention, the scheduler 350 divides the STC zone and the non-STC zone on a frame basis, and broadcasts these downlink frames to each terminal through the band signal processor 120 and the transmitter 130. do. This is explained in more detail.

The burst determiner 351 determines the size of the burst to be allocated to each terminal. That is, the burst determiner 351 distinguishes between the SISO supporting terminal and the MIMO supporting terminal, and determines the size of the burst to be allocated to the SISO supporting terminal and the size of the burst to be allocated to the MIMO supporting terminal in units of frames. At this time, the burst size of each terminal is determined in consideration of the QoS of each terminal.

The burst allocator 352 allocates the bursts determined by the burst determiner 351 to the downlink frame on a frame basis. That is, the burst allocator 352 allocates the SISO burst to the non-STC zone dedicated frame and the MIMO burst to the STC zone dedicated frame. At this time, in an environment in which there are a large number of SISO supporting terminals, the burst may be more adaptively allocated by making the transmission frequency of the non-STC zone dedicated frame higher than the transmission frequency of the STC zone dedicated frame.

The map recording unit 353 records burst allocation information for each terminal allocated by the burst allocating unit 352 in the map MAP. In this case, downlink burst allocation information for each terminal is recorded using a map information element on a downlink map. For example, since the non-STC zone dedicated frame is a frame only for the SISO supporting terminal, it is not necessary to record the zone switch information element in the downlink map. However, the STC zone dedicated frame is a frame only for the MIMO supporting terminal, but since the zone switch information element is needed once to distinguish it from the downlink PUSC subchannel period (that is, the non-STC zone), the map recorder 353 This zone switch information element is recorded in the downlink map.

12 is a diagram illustrating a fourth frame structure transmitted from a base station, and the scheduler 350 divides each frame into an STC zone dedicated frame and a non-STC zone dedicated frame.

Referring to FIG. 12, the scheduler 350 configures a non-STC zone dedicated frame for an Nth frame (frame N) and an STC zone dedicated frame for an N + 1th frame (frame N + 1). That is, the scheduler 350 is configured to sequentially transmit the non-STC zone dedicated frame and the STC zone dedicated frame. In this case, the scheduler 350 may transmit the non-STC zone dedicated frame and the STC zone dedicated frame in two frame periods. However, in some cases, when there are a large number of SISO-supporting terminals and a large amount of data to be transmitted, the scheduler 350 may transmit a transmission frequency of the non-STC zone dedicated frame. By increasing, adaptive data transmission is possible. In this case, the scheduler 150 may record frame information on whether the current frame is an STC zone dedicated frame or a non-STC zone dedicated frame in the FCH, but may also record it in another area in some cases. In the case of the FCH, it is also possible to record the above-mentioned frame information by using 4 bits reserved bits allocated to the FCH. That is, in the present embodiment, only one bit is used to record whether the frame is a STC zone dedicated frame or a non-STC zone dedicated frame on the FCH, but four frames (SISO, MIMO, SISO-HARQ to be described later using 2 bits or 3 bits) are recorded. And frames for the MIMO-HARQ burst) may be recorded in the FCH.

As another example, the scheduler 350 configures a non-STC zone dedicated frame for the Nth frame (frame N), configures an STC zone dedicated frame for the N + 1th frame (frame N + 1), and N + 2. The non-STC zone and the STC zone may be configured in one frame with respect to the first frame (frame N + 3). As such, the scheduler 350 may be configured to sequentially transmit non-STC zone dedicated frames and STC zone dedicated frames, and frames in which the non-STC zone and STC zone are mixed.

On the other hand, with the structure of such a frame unit, since the zone switch information element is used only once in the STC zone dedicated frame, the number of times of use of the zone switch information element per frame is higher than when the STC zone and the non-STC zone coexist in one frame. There is a feature that can reduce the map size by reducing.

In addition, when the STC zone and the non-STC zone coexist in one frame, one frame includes a pilot pattern for the non-STC zone and two pilot patterns for the STC zone (at a base station having a 2 × 2 MIMO structure) when the pilot is allocated. At least three pilot patterns had to be used for the purpose, but since at least one pilot pattern is used in the non-STC zone dedicated frame and only at least two pilot patterns are used in the STC zone dedicated frame, the complexity of the usable pilot pattern is reduced. have.

FIG. 13 is an exemplary diagram of a terminal configured to receive the frames of FIG. 12.

As shown in FIG. 13, the terminal is classified into an SISO supporting terminal and a MIMO supporting terminal, and commonly includes an FFT 410, a subcarrier extracting unit 430, and a subcarrier processing unit 450. In this case, the subcarrier extractor 430 includes a pilot extractor 431 and a data extractor 432, and the subcarrier processor 450 includes a channel estimator 451 and a decoder 452. Although not shown, the terminal further includes a controller for controlling the operation of the components. Hereinafter, parts similar to those described in the terminal of FIG. 9 will be omitted and only different points will be described.

Unlike the terminal of FIG. 9, the terminal of FIG. 13 eliminates the configuration of the STC zone determining unit 420 and the zone boundary checking unit 440, thereby reducing complexity. In addition, the terminal includes an area information checker (not shown) and decodes only the FCH for the signal of the frequency domain FFT-converted in the current frame, and then checks whether the current frame is an STC zone dedicated frame or a non-STC zone dedicated frame. Can be. Accordingly, the SISO supporting terminal does not need to decode the downlink map for the STC zone dedicated frame and also receives the corresponding downlink burst, and the MIMO supporting terminal does not need to decode the downlink map for the non-STC zone dedicated frame. There is no need to decode the signal, and there is no need to receive the corresponding downlink burst, thereby greatly reducing the complexity.

In addition, when the STC zone and the non-STC zone coexist in one downlink frame, the number of pilots that the subcarrier processing unit 450 can use for channel estimation is small. However, when the scheduler 350 divides and transmits the STC zone dedicated frame and the non-STC zone dedicated frame, the terminal increases the number of pilots that can be used for the above-described channel estimation and the like, thereby increasing accuracy in various processes including channel estimation. As such, there is a feature that can simplify processing on hardware in actual implementation.

The operation of the OFDM / OFDMA-based terminal configured as described above will be described with reference to FIGS. 14A and 14B.

First, in the case of the SISO support terminal, the FFT 410 converts a signal in the time domain received from the base station into a signal in the frequency domain (S461). The FCH is decoded from the converted frequency domain signal to determine whether the current frame is an STC zone dedicated frame or a non-STC zone dedicated frame (S462). If it is determined that the STC zone dedicated frame discards the current frame (S463), and if the non-STC zone dedicated frame checks the downlink map, the subcarrier extracting unit 430 may determine the SISO only when there is a data burst that matches its CID. The pilot and data subcarriers are extracted and stored (S464). Next, the channel is estimated using the extracted pilot, and the original data is restored after correcting the data subcarriers extracted by the subcarrier extraction unit 430 based on the estimated channel (S465).

Next, in the case of the MIMO supporting terminal, the FFT 410 converts a signal in the time domain received from the base station into a signal in the frequency domain (S471). The FCH is decoded from the converted frequency domain signal to determine whether the current frame is an STC zone dedicated frame or a non-STC zone dedicated frame (S472). As a result, if the non-STC zone dedicated frame discards the current frame (S473), if the STC zone dedicated frame checks the downlink map, the subcarrier extraction unit 430 is MIMO only when there is a data burst that matches its CID. The pilot and data subcarriers for the data are extracted and stored (S474). Next, the channel is estimated using the extracted pilot, and the original data is restored after correcting the data subcarrier extracted by the subcarrier extraction unit 430 based on the estimated channel (S475).

FIG. 15 is an exemplary diagram illustrating a timing diagram of processing the frames of FIG. 12 in the terminal of FIG. 13. FIG. 15 illustrates a timing diagram of an SISO or MIMO supporting terminal processing an STC zone dedicated frame and a non-STC zone dedicated frame transmitted in two frame periods. will be.

Referring to FIG. 15, power saving can be achieved by restoring one frame of the SISO supported terminal receiving the non-STC zone dedicated frame, and the MIMO supporting terminal receiving the STC zone dedicated frame can perform one frame of MIMO decoding processing. With room to spare, the decoding load is rarely pushed back due to the MIMO decoding processing speed.

On the other hand, as another embodiment of the present invention, the scheduler 550 configures a frame by dividing the STC zone and the non-STC zone on a frame basis, and considers whether the frame supports HARQ (Hybrid Automatic ReQuest) for each zone. The downlink frames are broadcast to each terminal through the band signal processor 120 and the transmitter 130. This is explained in more detail.

The burst determining unit 551 distinguishes between the HARQ supporting terminal and the HARQ non-supporting terminal and determines the size of the HARQ burst to be transmitted to the HARQ supporting terminal in units of frames. At this time, the burst size of each terminal is determined in consideration of the QoS of each terminal.

The burst allocator 552 assigns the bursts determined to be allocated to each terminal to the downlink frame on a frame basis. That is, the burst allocator 552 allocates the SISO burst to the non-STC zone dedicated frame and the MIMO burst to the STC zone dedicated frame. At this time, in an environment where there are a large number of SISO-supporting terminals, the burst is more adaptively allocated by making the transmission frequency of the non-STC zone dedicated frame higher than the transmission frequency of the STC zone dedicated frame.

In addition, the burst allocator 552 separates the HARQ burst for the HARQ support terminal from the above-described non-STC zone dedicated frame and STC zone dedicated frame and allocates them in units of frames. That is, the burst allocator 552 divides each burst into four frames, such as a non-STC zone dedicated frame, an STC zone dedicated frame, a non-STC zone dedicated HARQ frame, and an STC zone dedicated HARQ frame, and allocates each burst to the corresponding frame. Here, the non-STC zone dedicated frame is assigned an SISO burst, the STC zone dedicated frame is assigned a MIMO burst, the non-STC zone dedicated HARQ frame is assigned an HARQ burst for the SISO-HARQ supporting terminal, and the STC zone dedicated HARQ frame Is assigned a HARQ burst for the MIMO-HARQ supported terminal.

In addition, the burst allocator 552 allows bursts to be more adaptively allocated by making the transmission frequency of the non-STC zone dedicated frame higher than the transmission frequency of the STC zone dedicated frame in an environment having a large number of SISO supporting terminals. For example, the burst allocator 552 is divided into six periods such as a non-STC zone dedicated frame, an STC zone dedicated frame, a non-STC zone dedicated frame, a non-STC zone dedicated HARQ frame, a non-STC zone dedicated frame, and an STC zone dedicated HARQ frame. Each burst may be assigned to the corresponding frame.

The map recording unit 553 records burst allocation information for each terminal allocated by the burst allocating unit 552 in the map MAP. At this time, the map recorder 553 records burst allocation information for each terminal by using the map information element in the downlink map, and records each by using the map information element in the HARQ map for the HARQ burst. For example, the STC zone dedicated frame is a frame only for the MIMO supporting terminal, but the zone recording information element is needed once to distinguish the downlink PUSC subchannel interval (ie, corresponding to the non-STC zone). This zone switch information element is recorded in the downlink map.

In addition, the map recorder 553 records size information on the HARQ bursts allocated to the respective frames in the HARQ map for the non-STC zone dedicated HARQ frame and the STC zone dedicated HARQ frame.

FIG. 16 is a diagram illustrating a structure of a fifth frame transmitted from a base station, wherein the scheduler 550 includes frames to be transmitted to a terminal in an STC zone dedicated frame, a non-STC zone dedicated frame, an STC zone dedicated HARQ frame, and a non-STC. Configured by zone-specific HARQ frame.

Referring to FIG. 16, the scheduler 550 is configured as a non-STC zone dedicated frame for the Nth frame (frame N), and is configured as an STC zone dedicated frame for the N + 1th frame (frame N + 1). A non-STC zone dedicated HARQ frame is configured for the N + 2th frame (frame N + 2), and a STC zone dedicated HARQ frame is configured for the N + 3th frame (frame N + 3). In this way, the scheduler 550 divides the frame into four periods so that the non-STC zone dedicated frame, the STC zone dedicated frame, the non-STC zone dedicated HARQ frame, and the STC zone dedicated HARQ frame are sequentially transmitted.

Meanwhile, as described above, the scheduler 550 allows bursts to be more adaptively allocated by making the transmission frequency of the non-STC zone dedicated frame higher than the transmission frequency of the STC zone dedicated frame in an environment having a large number of SISO supporting terminals. For example, the burst allocator 552 is divided into six periods such as a non-STC zone dedicated frame, an STC zone dedicated frame, a non-STC zone dedicated frame, a non-STC zone dedicated HARQ frame, a non-STC zone dedicated frame, and an STC zone dedicated HARQ frame. Each burst may be assigned to the corresponding frame.

Also, as another example, the scheduler 550 is configured as a non-STC zone dedicated frame for the Nth frame (frame N), and is configured as an STC zone dedicated frame for the N + 1th frame (frame N + 1), and N Configure a non-STC zone dedicated HARQ frame for the +2 th frame (frame N + 2), configure an STC zone dedicated HARQ frame for the N + 3 th frame (frame N + 3), and configure the N + 4 th frame For (frame N + 4), a non-STC zone and an STC zone may be configured in the one frame. In this way, the scheduler 550 may be configured to sequentially transmit non-STC zone dedicated frames, STC zone dedicated frames, non-STC zone dedicated HARQ frames, STC zone dedicated HARQ frames, and frames mixed with non-STC zones and STC zones. have.

The configuration of a terminal according to another embodiment of the present invention is shown in FIG.

As shown in FIG. 13, the terminal is classified into an SISO supporting terminal and a MIMO supporting terminal, and commonly includes an FFT 610, a subcarrier extracting unit 630, and a subcarrier processing unit 650. In this case, the subcarrier extractor 630 includes a pilot extractor 631 and a data extractor 632, and the subcarrier processor 650 includes a channel estimator 651 and a decoder 652. Although not shown, the terminal further includes a controller for controlling the operation of the components. Hereinafter, parts similar to those described in the terminal of FIG. 9 will be omitted and only different points will be described.

Unlike the terminal of FIG. 9, the terminal of the present embodiment does not require the configuration of the STC zone determining unit 620 and the zone boundary checking unit 640, thereby reducing complexity. In addition, the terminal includes an area information checking unit (not shown) and decodes the FCH for the signal of the frequency domain FFT-converted in the current frame, and then whether the current frame is an STC zone dedicated frame or a non-STC zone dedicated frame. It may be determined whether the STC zone dedicated HARQ frame or the non-STC zone dedicated HARQ frame. Accordingly, the SISO supporting terminal (not supporting HARQ) does not need to decode the downlink map for the STC zone dedicated frame, and there is no need to receive the corresponding downlink burst, and the MIMO supporting terminal (not supporting HARQ) is not required. There is no need to decode the downlink map for the STC zone dedicated frame, and there is no need to receive the corresponding downlink burst, thereby greatly reducing the complexity. In addition, the SISO-HARQ support terminal does not need to decode the downlink map for the STC zone dedicated HARQ frame, and the MIMO-HARQ support terminal does not need to decode the downlink map for the non-STC zone dedicated HARQ frame.

The operation of the OFDM / OFDMA-based terminal configured as described above will be described with reference to FIGS. 17 to 20. Here, FIG. 17 illustrates the operation of the SISO-supported (non-HARQ) terminal, FIG. 18 illustrates the operation of the SISO-HARQ-supported terminal, FIG. 19 illustrates the operation of the MIMO-supported (non-HARQ) terminal, and FIG. 20 illustrates MIMO-. Indicates the operation of the HARQ support terminal.

First, in the case of an SISO supported (HARQ not supported) terminal, the FFT 610 converts a signal in the time domain received from the base station into a signal in the frequency domain (S661). The FCH is decoded from the converted frequency domain signal to determine whether the current frame is an STC zone related frame or a non-STC zone related frame (S662). Here, the STC zone related frame refers to an STC zone dedicated frame and an STC zone dedicated HARQ frame, and the non-STC zone related frame refers to a non-STC zone dedicated frame and a non-STC zone dedicated HARQ frame. As a result of the check, if the frame is STC zone related, the currently received frame is discarded (S663-S664). However, if the frame is a non-STC related frame, the downlink map is checked to find out whether there is a data burst matching the CID. (S665-S666). As a result of the search, if there is no current frame is discarded, if present, the subcarrier extractor 630 extracts and stores the pilot and data subcarriers for the SISO (S667). Next, the subcarrier processing unit 650 estimates a channel using the extracted pilot, corrects the data subcarriers extracted by the subcarrier extraction unit 630 based on the estimated channel, and restores the original data (S668). .

In the case of the SISO-HARQ supporting terminal, the FFT 610 converts a signal in the time domain received from the base station into a signal in the frequency domain (S671). The FCH is decoded from the converted frequency domain signal to determine whether the current frame is an STC zone related frame or a non-STC zone related frame (S672). As a result of the check, if the STC zone-related frame is discarded (S673-S674). However, as a result of the check, if the frame is a non-STC zone, the downlink map (or the HARQ map in the downlink map) is checked to find out whether there is a downlink burst or a HARQ burst that matches its CID (S675-S676). If the search result does not exist, the frame is discarded (S674). On the other hand, if the search result of step S676, if present, the subcarrier extractor 630 extracts and stores the pilot and data subcarriers for the SISO (S677). Next, the subcarrier processing unit 650 estimates a channel using the extracted pilot, corrects the data subcarriers extracted by the subcarrier extraction unit 630 based on the estimated channel, and restores the original data (S678). .

In the case of a MIMO supported (HARQ not supported) terminal, the FFT 610 converts a signal in the time domain received from the base station into a signal in the frequency domain (S681). The FCH is decoded from the converted frequency domain signal to determine whether the current frame is an STC zone related frame or a non-STC zone related frame (S682). If it is determined that the frame is related to the non-STC zone, the current frame is discarded (S683-S684). However, if the frame is related to the STC zone, the downlink map is checked to find whether there is a data burst matching the CID. (S685-S686). As a result of the search, the current frame is discarded if not present, but if present, the subcarrier extraction unit 630 extracts and stores the pilot and data subcarriers for the MIMO (S687). Next, the subcarrier processing unit 650 estimates a channel using the extracted pilot, corrects the data subcarriers extracted by the subcarrier extraction unit 630 based on the estimated channel, and restores the original data (S688). .

In the case of the MIMO-HARQ supporting terminal, the FFT 610 converts a signal in the time domain received from the base station into a signal in the frequency domain (S691). The FCH is decoded from the converted frequency domain signal to determine whether the current frame is an STC zone related frame or a non-STC zone related frame (S692). If it is confirmed that the non-STC zone related frame, the current frame is discarded (S693-S694). However, as a result of the check, if the STC zone-related frame, the downlink map (or HARQ map in the downlink map) is checked to find out whether there is a downlink burst or a HARQ burst that matches its CID (S695-S696). As a result of the search, if not present, the frame is discarded (S694). On the other hand, if the search result of step S696, if present, the subcarrier extractor 630 extracts and stores the pilot and data subcarriers for MIMO (S698). Next, the subcarrier processing unit 650 estimates a channel using the extracted pilot, corrects the data subcarriers extracted by the subcarrier extraction unit 630 based on the estimated channel, and restores the original data (S699). .

Until now, only 1 bit of the FCH is used for the transmission frame of the base station to indicate whether the STC zone dedicated frame or the non-STC zone dedicated frame. In addition, when the base station uses two or three bits of the FCH, the terminal may not decode the downlink map (including the HARQ map) of a specific frame.

For example, if the base station uses 2 bits of FCH, 00 is designated as a non-STC zone dedicated frame, '01' is designated as a non-STC zone dedicated HARQ frame, '10' is designated as an STC zone dedicated frame, and '11' is designated as an STC zone dedicated. Can be set to HARQ frame. After receiving the frame set as described above, the terminal decodes the FCH and may determine whether to decode the downlink map according to its support capability. That is, the SISO support terminal (non-HARQ) decodes the downlink map only when '00' (non-STC zone dedicated frame), and the SISO-HARQ support terminal decodes the downlink map only when '00' or '01'. Decode The MIMO support terminal does not decode the downlink map only when '11'. The MIMO HARQ support terminal decodes the downlink map for all cases.

In addition, when the base station uses 4 bits of the FCH, '0000' is a non-STC zone dedicated frame, '0001' is a non-STC zone dedicated HARQ frame, '0010' is an STC zone dedicated frame, and '0011' is an STC. Zone-only HARQ frame, '0100' is a frame allocated by mixing SISO burst and SISO-HARQ burst, '0101' is a frame allocated by mixing SISO burst and MIMO burst, and '0110' is assigned by MIMO burst and MIMO -HARQ burst is a mixed frame, '0111' is a frame allocated by mixing SISO-HARQ burst and MIMO-HARQ burst. '1000' is a frame allocated by mixing SISO burst and MIMO-HARQ burst. For example, '1001' may be set to an allocated frame in which MIMO bursts and SISO-HARQ bursts are mixed.

On the other hand, when the base station uses 3 bits of FCH, the frame allocated by mixing the SISO burst and the MIMO-HARQ burst out of the above 10 and the frame allocated by mixing the MIMO burst and the SISO-HARQ burst are not used. That is, '000' as a non-STC zone dedicated frame, '001' as a non-STC zone dedicated HARQ frame, '010' as a STC zone dedicated frame, '011' as an STC zone dedicated HARQ frame, and '100' A frame assigned with a mixture of SISO bursts and SISO-HARQ bursts. 101 is assigned with a mixture of SISO bursts and MIMO bursts. 110 is assigned with a mixture of MIMO bursts and MIMO-HARQ bursts. , '111' can be set only to a frame allocated by mixing SISO-HARQ burst and MIMO-HARQ burst.

Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art to which the present invention pertains can implement the present invention in other specific forms without changing the technical spirit or essential features, The examples are to be understood in all respects as illustrative and not restrictive.

In addition, the scope of the present invention is specified by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be interpreted as

1 is a diagram illustrating a frame structure transmitted from an OFDM / OFDMA based base station to a terminal.

2 is a diagram illustrating an OFDM / OFDMA based base station.

3 is a block diagram showing a scheduler according to the first, second, and third embodiments of the present invention.

4 is an exemplary diagram illustrating use of a zone switch information element in a downlink map (DL MAP).

FIG. 5 is a diagram illustrating a pilot pattern when a downlink PUSC subchannel is used in a base station. FIG.

6 is a diagram illustrating a structure of a first frame transmitted from a base station to a terminal.

7 is a diagram illustrating a structure of a second frame transmitted from a base station to a terminal.

8 is a diagram illustrating a structure of a third frame transmitted from a base station to a terminal.

9 is a view showing the configuration of a terminal according to an embodiment of the present invention.

10A is a flowchart illustrating an operation of an SISO supporting terminal according to an embodiment of the present invention.

10B is a flowchart illustrating the operation of a MIMO supporting terminal according to an embodiment of the present invention.

11 illustrates a timing diagram of a terminal according to an embodiment of the present invention.

12 illustrates a fourth frame structure transmitted from a base station.

13 is a view showing the configuration of a terminal according to other embodiments of the present invention.

14A is a flowchart illustrating an operation of an SISO supporting terminal according to another embodiment of the present invention.

14B is a flowchart illustrating the operation of a MIMO supporting terminal according to another embodiment of the present invention.

15 is a timing diagram of a terminal according to another embodiment of the present invention.

16 is a diagram illustrating a structure of a fifth frame transmitted from a base station.

17 is a flowchart illustrating the operation of a SISO supported / HARQ non-supported terminal according to another embodiment of the present invention.

18 is a flowchart illustrating operation of a SISO support / HARQ support terminal according to another embodiment of the present invention.

19 is a flowchart illustrating operation of a MIMO supported / HARQ non-supported terminal according to another embodiment of the present invention.

20 is a flowchart illustrating the operation of a MIMO support / HARQ support terminal according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

150, 350, 550: scheduler,

151, 351, 551: burst determining unit 152, 352, 552: burst allocating unit

153, 353, 553: map log

210, 410, 610: FFT 230, 430, 630: subcarrier extraction unit

250, 450, and 650: subcarrier processing unit

Claims (40)

A method of transmitting a downlink frame in a wireless communication system supporting Single Input Single Output (SISO) and Multiple Input Multiple Output (MIMO), Determining sizes of SISO bursts and MIMO bursts, respectively; Constructing a frame for transmission of the bursts, each constructing a frame for the SISO burst and a frame for the MIMO burst; And Assigning and transmitting the bursts to the frames according to the determined bursts; In this case, the frame for the MIMO burst is recorded in a downlink map using a zone switch information element so as to distinguish the STC region (Space-Time Coding zone) to which the MIMO burst is allocated and the remaining region. Link frame transmission method. delete The method of claim 1, And recording in the frame control header (FCH) of the frames to which the bursts are assigned whether the frame is for the SISO burst or the frame for the MIMO burst. The method of claim 1, wherein the configuring step, And further configuring frames for the SISO burst and the MIMO burst. The method according to claim 1 or 3 or 4, wherein the MIMO burst, A downlink frame divided into a burst for a Space Time Transmit Diversity (STTD) mode and a burst for a Spatial Multiplexing (SM) mode, and placing a burst for the SM mode in front of the burst for the STTD mode on a time axis; Transmission method. A method for receiving a downlink frame in a wireless communication system in a mixed environment of an SISO supporting terminal and a MIMO supporting terminal, (a) receiving a frame comprising at least one of a transmission region for an SISO or MIMO burst; (b) confirming transmission area information through a frame control header (FCH) in the received frame; And (c) determining whether to perform decoding on the downlink map of the received frame according to the verification result and whether the terminal is the SISO supporting terminal or the MIMO supporting terminal. The method of claim 6, and (d) performing decoding on the burst in the transmission area according to the determination result. A method for transmitting downlink frames in a wireless communication system supporting SISO and MIMO, Determining the magnitude of the SISO burst and the MIMO burst; And The bursts are transmitted by allocating a non-STC zone for the MIMO burst transmission and a non-STC zone for the SISO burst transmission according to the size of the determined bursts in one downlink frame. Including the steps of: Here, the method for transmitting a downlink frame, characterized in that the zone switch information element for distinguishing the STC region and the non-STC region is recorded in a downlink map. delete The method of claim 8, wherein the STC region, A burst allocation area for STTD (Space Time Transmit Diversity) mode and a burst allocation area for Spatial Multiplexing (SM) mode, and the burst allocation area for the SM mode is located in front of the burst allocation area for the STTD mode on the time axis. Downlink frame transmission method characterized in that. delete A method for transmitting a downlink frame in a wireless communication system supporting SISO, MIMO, Hybrid Automatic ReQuest (SISO-HARQ), and MIMO-HARQ, Determining the magnitude of the SISO burst, the MIMO burst, the SISO-HARQ burst, and the MIMO-HARQ burst; Constructing a frame for transmission of the bursts, the frame for the SISO burst, the frame for the SISO-HARQ burst, the frame for the MIMO burst, and the frame for the MIMO-HARQ burst, respectively; And Assigning and transmitting the bursts to the configured frames according to the determined bursts; Here, with respect to the frame for the MIMO burst, downlink frame transmission, the zone switch information element is recorded in the downlink map so that the space-time coding (STC) area for the MIMO burst transmission and the remaining area are distinguished. Way. The method of claim 12, And transmitting transmission area information of a frame for transmission of the bursts in a frame control header (FCH). A method for transmitting a downlink frame in a wireless communication system supporting SISO, MIMO, Hybrid Automatic ReQuest (SISO-HARQ), and MIMO-HARQ, Determining the magnitude of the SISO burst, the MIMO burst, the SISO-HARQ burst, and the MIMO-HARQ burst; Constructing a frame for transmission of the bursts, the frame for the SISO burst, the frame for the SISO-HARQ burst, the frame for the MIMO burst, and the frame for the MIMO-HARQ burst, respectively; And Assigning and transmitting the bursts to the configured frames according to the determined bursts; Here, the allocation information of the SISO burst for the frame for the SISO burst is recorded two-dimensionally in a downlink map using a subchannel index and a symbol index, and the allocation information of the MIMO burst for the frame for the MIMO burst. Downlink frame transmission method using the sub-channel index and the symbol index in two dimensions in the downlink map. A method for transmitting a downlink frame in a wireless communication system supporting SISO, MIMO, Hybrid Automatic ReQuest (SISO-HARQ), and MIMO-HARQ, Determining the magnitude of the SISO burst, the MIMO burst, the SISO-HARQ burst, and the MIMO-HARQ burst; Constructing a frame for transmission of the bursts, the frame for the SISO burst, the frame for the SISO-HARQ burst, the frame for the MIMO burst, and the frame for the MIMO-HARQ burst, respectively; And Assigning and transmitting the bursts to the configured frames according to the determined bursts; Here, the frame for the SISO-HARQ burst and the frame for the MIMO-HARQ burst, downlink frame transmission method characterized in that to record the size of the HARQ burst in the HARQ map of the frame in each one dimension. The method of claim 12, wherein the MIMO burst, A downlink frame divided into a burst for a Space Time Transmit Diversity (STTD) mode and a burst for a Spatial Multiplexing (SM) mode, and placing a burst for the SM mode in front of the burst for the STTD mode on a time axis; Transmission method. A method for receiving a downlink frame in a wireless communication system in a mixed environment of SISO, SISO-HARQ, MIMO, and MIMO-HARQ supporting terminals, (a) receiving a frame comprising at least one of a transmission region for a SISO, SISO-HARQ, MIMO, or MIMO-HARQ burst; (b) confirming transmission area information through a frame control header (FCH) in the received frame; And (c) determining whether to perform decoding on the downlink map of the received frame according to the confirmation result and whether the terminal is the SISO, SISO-HARQ, MIMO, or MIMO-HARQ supported terminal. Downlink frame reception method. The method of claim 17, and (d) performing decoding on the burst in the transmission area according to the determination result. A base station for transmitting a downlink frame in a wireless communication system supporting SISO and MIMO burst, A burst determining unit configured to determine, in units of frames, the size of the SISO burst and the MIMO burst to be allocated to the SISO supporting terminals and the MIMO supporting terminals, respectively; And And a burst allocator for allocating the sized SISO burst and the MIMO burst to the dedicated frames so as to configure a dedicated frame for the SISO burst and a dedicated frame for the MIMO burst, respectively. The method of claim 19, And a map recording unit for recording a zone switch information element on a downlink map so that a space-time coding zone (STC) to which the MIMO burst is allocated and a remaining area are distinguished with respect to the dedicated frame for the MIMO burst. Base station. The method of claim 19, And FCH recording means for recording in the frame control header (FCH) of the dedicated frames to which the bursts are assigned whether the dedicated frame is for the SISO burst or the dedicated frame for the MIMO burst. The apparatus of claim 19, wherein the burst allocator comprises: And configuring frames for the SISO burst and the MIMO burst when configuring the dedicated frames. 23. The method of any of claims 19 to 22, wherein the MIMO burst is And a burst for a space time transmit diversity (STTD) mode and a burst for a spatial multiplexing (SM) mode, wherein the burst for the SM mode is located in front of the burst for the STTD mode on a time axis. A terminal for receiving a downlink frame in a wireless communication system under a mixed environment of an SISO supporting terminal and a MIMO supporting terminal, A receiver configured to receive a frame including at least one of a transmission region for an SISO or MIMO burst; An area information confirming unit confirming transmission area information through a frame control header (FCH) in the received frame; And And a controller configured to determine whether to perform decoding on the downlink map of the received frame according to the verification result and whether the terminal is the SISO supporting terminal or the MIMO supporting terminal. The method of claim 24, wherein the control unit, And control to perform decoding on the burst in the transmission area according to the determination result. A base station for transmitting a downlink frame in a wireless communication system supporting SISO and MIMO, A burst allocator for determining the size of the SISO burst and the MIMO burst; And A burst allocation unit for allocating an STC region for the MIMO burst transmission and a non-STC region for the SISO burst transmission to one downlink frame according to the determined bursts; Wherein the base station records zone switch information elements that distinguish the STC region from the non-STC region in a downlink map. delete The method of claim 26, wherein the STC region, A burst allocation area for STTD (Space Time Transmit Diversity) mode and a burst allocation area for Spatial Multiplexing (SM) mode, and the burst allocation area for the SM mode is located in front of the burst allocation area for the STTD mode on the time axis. Base station, characterized in that. A base station for transmitting a downlink frame in a wireless communication system supporting SISO, MIMO, SISO-HARQ, MIMO-HARQ, A burst determiner for determining the size of a transmit SISO burst, a MIMO burst, a SISO-HARQ burst, and a MIMO-HARQ burst; And Configure a frame for transmission of the bursts, and separately configure a frame for a SISO burst, a frame for a SISO-HARQ burst, a frame for a MIMO burst, and a frame for a MIMO-HARQ burst, and determine the size of the determined bursts. And a burst allocator for allocating the bursts to the separately configured frames. The method of claim 29, And a map recording unit for recording a frame for the MIMO burst in a downlink map using a zone switch information element so that a space-time coding (STC) area to which the MIMO burst is allocated and a remaining area are distinguished. Base station. The method of claim 30, wherein the map recording unit, The allocation information of the SISO burst for the frame for the SISO burst is recorded two-dimensionally in a downlink map using a subchannel index and a symbol index, and the allocation information of the MIMO burst for the frame for the MIMO burst is recorded. And a base station recording in a downlink map in two dimensions using the subchannel index and the symbol index. The method of claim 30, wherein the map recording unit, And a base station configured to record the size of the HARQ burst in one dimension in the HARQ map of the frame for the SISO-HARQ burst and the frame for the MIMO-HARQ burst. The method of claim 29, And FCH recording means for recording the frame information for the frames to which the bursts are allocated in a frame control header (FCH). 34. The method of any one of claims 29 to 33, wherein the MIMO burst is And a burst for a Space Time Transmit Diversity (STTD) mode and a burst for a Spatial Multiplexing (SM) mode, wherein the burst for the SM mode is located in front of the burst for the STTD mode on a time axis. A terminal for receiving a downlink frame in a wireless communication system in a mixed environment of SISO, SISO-HARQ, MIMO, and MIMO-HARQ supporting terminals, A receiver configured to receive a frame including at least one of a transmission region for SISO, SISO-HARQ, MIMO, or MIMO-HARQ burst; An area information confirming unit confirming transmission area information through a frame control header (FCH) in the received frame; And a controller configured to determine whether to perform decoding on the downlink map of the received frame according to the verification result and whether the terminal supports the SISO, SISO-HARQ, MIMO, or MIMO-HARQ. The method of claim 35, wherein the control unit, And control to perform decoding on the burst in the transmission area according to the determination result. A method for transmitting a frame in a wireless system in an environment in which MIMO terminals and SISO terminals that support or do not support the HARQ function are mixed, Respectively configuring dedicated frames including a data area including one of a non-STC area, a non-STC area, a non-STC-HARQ area, and an STC-HARQ area; And Transmitting the dedicated frames to terminals; The transmission period of the dedicated frames is determined based on at least one of the number of MIMO terminals and the number of SISO terminals. The method of claim 37, wherein the transmitting step, A dedicated frame including a data area consisting of the non-STC area, a dedicated frame including a data area consisting of the STC area, and a data frame consisting of one of the HARQ areas in the transmission period. The frame transmission method characterized by the transmission in order. A method for transmitting a frame in a wireless communication system in a mixed environment of a MIMO terminal and a SISO terminal, Constructing a subframe including a data area configured in the order of a non-STC area and an STC area on a time axis; And Transmitting the subframe to terminals, Here, the STC region is divided into a burst allocation region for a Space Time Transmit Diversity (STTD) mode and a burst allocation region for a Spatial Multiplexing (SM) mode, and the burst allocation region for the SM mode on the time axis. And a burst allocation area for the frame transmission method. delete

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